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ASM3P2780AG-08ST Datasheet(PDF) 1 Page - Alliance Semiconductor Corporation |
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ASM3P2780AG-08ST Datasheet(HTML) 1 Page - Alliance Semiconductor Corporation |
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1 / 12 page  September 2005 ASM3P2780A rev 1.5 Alliance Semiconductor 2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com Notice: The information in this document is subject to change without notice. Low Power Peak EMI Reducing Solution Features Generates an EMI optimized clock signal at the output. Integrated loop filter components. Operates with a 3.3 / 2.5V Supply. Operating current less than 5mA. Low power CMOS design. Input frequency range: 30MHz to 50MHz for 2.5V. : 30MHz to 50MHz for 3.3V. Generates a 1X low EMI spread spectrum clock of the input frequency. Frequency deviation: ±0.75% (Typ) @46MHz Input Frequency. Available in 6 pin TSOT-23, 8 pin SOIC and 8 pin TSSOP Packages. Product Description The ASM3P2780A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2780A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2780A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding that are traditionally required to pass EMI regulations. The ASM3P2780A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2780A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘spread spectrum clock generation’. Applications The ASM3P2780A is targeted towards all portable devices with very low power requirements like MP3 players and digital still cameras. Key Specifications Description Specification Supply voltages VDD = 3.3V / 2.5V Cycle-to-Cycle Jitter 200pS (Max) Output Duty Cycle 45/55% Modulation Rate Equation FIN/1280 Frequency Deviation ±0.75 (Typ) @ 46MHz Block Diagram ModOUT VSS XIN/CLKIN Frequency Divider Feedback Divider Modulation Phase Detector Loop Filter VCO Output Divider PLL VDD PD Crystal Oscillator XOUT |
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